He thought he might be able to retire and help pay for her college, and help pay for Mark’s art course. It was actually a really sweet scene IMO. Also I think any added financial burden of having Darlene and her kids living with him is erased by the joy they bring him. Like in the last episode, he tells Darlene to go live her life but once she leaves the room we see he is upset about it.
Since he didnt get the big payout, she probably will do the community college route first, barring any other bad life choices- let’s see if Harris can make it through high school and college without getting married or pregnant lol.